1 files changed, 99 insertions, 0 deletions
diff --git a/lib/util/string_wrappers.h b/lib/util/string_wrappers.h
new file mode 100644
index 0000000..00bce07
--- /dev/null
+++ b/lib/util/string_wrappers.h
@@ -0,0 +1,99 @@
+/*
+   Unix SMB/CIFS implementation.
+
+   string wrappers, for checking string sizes
+
+   Copyright (C) Andrew Tridgell 1994-2011
+   Copyright (C) Andrew Bartlett <abartlet@samba.org> 2003
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef _STRING_WRAPPERS_H
+#define _STRING_WRAPPERS_H
+
+#include "lib/replace/replace.h" /* for config symbols */
+
+#define strlcpy_base(dest, src, base, size) \
+do { \
+	const char *_strlcpy_base_src = (const char *)src; \
+	strlcpy((dest), _strlcpy_base_src? _strlcpy_base_src : "", (size)-PTR_DIFF((dest),(base))); \
+} while (0)
+
+/* String copy functions - macro hell below adds 'type checking' (limited,
+   but the best we can do in C) */
+
+#define fstrcpy(d,s) \
+do { \
+	const char *_fstrcpy_src = (const char *)(s); \
+	strlcpy((d),_fstrcpy_src ? _fstrcpy_src : "",sizeof(fstring)); \
+} while (0)
+
+#define fstrcat(d,s) \
+do { \
+	const char *_fstrcat_src = (const char *)(s); \
+	strlcat((d),_fstrcat_src ? _fstrcat_src : "",sizeof(fstring)); \
+} while (0)
+#define unstrcpy(d,s) \
+do { \
+	const char *_unstrcpy_src = (const char *)(s); \
+	strlcpy((d),_unstrcpy_src ? _unstrcpy_src : "",sizeof(unstring)); \
+} while (0)
+
+#ifdef HAVE_COMPILER_WILL_OPTIMIZE_OUT_FNS
+
+/* We need a number of different prototypes for our
+   non-existent fuctions */
+char * __unsafe_string_function_usage_here__(void);
+
+size_t __unsafe_string_function_usage_here_size_t__(void);
+
+NTSTATUS __unsafe_string_function_usage_here_NTSTATUS__(void);
+
+#define CHECK_STRING_SIZE(d, len) (sizeof(d) != (len) && sizeof(d) != sizeof(char *))
+
+/* if the compiler will optimize out function calls, then use this to tell if we are
+   have the correct types (this works only where sizeof() returns the size of the buffer, not
+   the size of the pointer). */
+
+#define push_string_check(dest, src, dest_len, flags) \
+    (CHECK_STRING_SIZE(dest, dest_len) \
+    ? __unsafe_string_function_usage_here_size_t__() \
+    : push_string_check_fn(dest, src, dest_len, flags))
+
+#define srvstr_push(base_ptr, smb_flags2, dest, src, dest_len, flags, ret_len) \
+    (CHECK_STRING_SIZE(dest, dest_len) \
+    ? __unsafe_string_function_usage_here_NTSTATUS__() \
+    : srvstr_push_fn(base_ptr, smb_flags2, dest, src, dest_len, flags, ret_len))
+
+/* This allows the developer to choose to check the arguments to
+   strlcpy.  if the compiler will optimize out function calls, then
+   use this to tell if we are have the correct size buffer (this works only
+   where sizeof() returns the size of the buffer, not the size of the
+   pointer), so stack and static variables only */
+
+#define checked_strlcpy(dest, src, size) \
+    (sizeof(dest) != (size) \
+    ? __unsafe_string_function_usage_here_size_t__() \
+     : strlcpy(dest, src, size))
+
+#else
+
+#define push_string_check push_string_check_fn
+#define srvstr_push srvstr_push_fn
+#define checked_strlcpy strlcpy
+
+#endif
+
+#endif